import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Teller {

    JLabel tekstfelt;
    JButton oek;
    int tellerverdi;
    
    public Teller(){
        try {
            UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
        } catch (Exception e) {
            System.exit(1);
        }

        JFrame vindu = new JFrame("Teller");
        vindu.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPanel panel = new JPanel();
        vindu.add(panel);

        tellerverdi = 0;
        tekstfelt = new JLabel(tellerverdi+"");
        panel.add(tekstfelt);

        oek = new JButton("+1");
        oek.addActionListener(new Oek());
        panel.add(oek);


        vindu.pack();
        vindu.setVisible(true);

    }

    class Oek implements ActionListener{
        @Override
        public void actionPerformed(ActionEvent e){
            tellerverdi ++;
            tekstfelt.setText(tellerverdi+"");
        }
    }

    public static void main(String[] args) {
        Teller teller = new Teller();
    }
}